You should consider another option:
Larger tow vehicle with a regular trailer (15-21 foot). It beats the tent trailer in storage (have all your stuff ready to go minus the perishable food) and weather proof-ness while out canping. It also beats the RV because you do not have to maintain, register and insure a 3rd vehicle. Plus, when you arrive at you location, you can leave the trailer and go places in your tow vehicle.
That's my two cents. We roughen it tent camping. There you don't need any of the above, save on gas an can go car speeds (with any type of trailer you are down to 55 mph) and everyone is so excited to come home!
George